> From: Stefano Garzarella <[email protected]>
> Sent: Monday, February 15, 2021 5:16 PM
>
> On Sat, Feb 13, 2021 at 08:39:19PM +0200, Parav Pandit wrote:
> >When device get command fails to find the device or mdev, it skips to
> >free the skb during error unwinding path.
> >Fix it by freeing in error unwind path.
> >
> >Fixes: a12a2f694ce8 ("vdpa: Enable user to query vdpa device info")
> >Signed-off-by: Parav Pandit <[email protected]>
> >---
> > drivers/vdpa/vdpa.c | 8 +++++---
> > 1 file changed, 5 insertions(+), 3 deletions(-)
> >
> >diff --git a/drivers/vdpa/vdpa.c b/drivers/vdpa/vdpa.c index
> >3d997b389345..e3f1bfdf8d6f 100644
> >--- a/drivers/vdpa/vdpa.c
> >+++ b/drivers/vdpa/vdpa.c
> >@@ -540,20 +540,22 @@ static int vdpa_nl_cmd_dev_get_doit(struct
> sk_buff *skb, struct genl_info *info)
> > if (!dev) {
> > mutex_unlock(&vdpa_dev_mutex);
> > NL_SET_ERR_MSG_MOD(info->extack, "device not found");
> >- return -ENODEV;
> >+ err = -ENODEV;
> >+ goto err;
> > }
> > vdev = container_of(dev, struct vdpa_device, dev);
> > if (!vdev->mdev) {
> > mutex_unlock(&vdpa_dev_mutex);
> > put_device(dev);
> >- return -EINVAL;
> >+ err = -EINVAL;
> >+ goto err;
> > }
> > err = vdpa_dev_fill(vdev, msg, info->snd_portid, info->snd_seq, 0,
> info->extack);
> > if (!err)
> > err = genlmsg_reply(msg, info);
> > put_device(dev);
> > mutex_unlock(&vdpa_dev_mutex);
> >-
> >+err:
>
> If we put this label before mutex_unlock(), we can remove that call in the
> error paths.
>
> Maybe we can also add another label before put_device() and jump to it in
> the "if (!vdev->mdev)" case.
>
Yep, I will send v2.
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